Spray table



Sept. 1, 1931. F. G. DENNISON SPRAY TABLE `Filed Dec. 27, 1929 2 .Sheets-Sheet l Sept. 1, 1931.

F. -G. DENNISON SPRAY TABLE Filed Dec. 27, 1929 2 Sheets-Sheet 2 '45 Fig. 2-is a Patented Sept. 1, 1931 rentar @uurs` STATES lPAT' lfrla'lf-orriea FRANKk G. DENNISON, NEWTON, MIASSAC1-IUSljYJYISiAlSSIGfNOlt'TO` SPRACO, INC., OF

SOMERVLLE, MASSACHUSETTS, A CRPORAFIONOF :MSSACHSETTS` SPRAY 'mustnI f Application filed. Becember 27,V 1929."` S'eral No.v 416,870.

' -K The present invention relates yto the art ofV industrial'inishing, and more particularly to a spray bench or table yfor support- A, ing thel work during the spraying operation. It has'l been customary heretofore in the manufacture ,of jewelry, and other small articles, yto house the Vwork during the spraying operation in spray booths in which the work is coatedwith paint, lacquer or some other fi10 coating material, and from-which the fumes generated yin the spraying operation are withdrawn to the vatmosphere outside the factory yby an electrick motor driven device operating to draw or blowthe fumes from I'3515 the boothor to induce the fumes toflow therefrom.y It is impracticable vfor more than two operatives to work in a spray booth at a time. In consequence, if a facl toryV requires the services of eight opera- *530 tives, for instance, four spray booths, each means comprising a single motor thus to economize in theinitial cost of equipment and the use of space and power.

suchv others as may hereinafter appear, the various features ofthe present invention reside in certain combinations and arrangements of parts fully set forth hereinafter, the advantages ofwhich will be readily apparent to those skilled inthe art.

The `various features of the present invention will be Yreadily understood froman inspection of the accompanying drawings illustrating the best form ofthe invention at present known to the invent-or, in which,

Figure 1 is a view in elevation of the spray table; Y f

view in sectiona-l'plan, the work supporting trays being broken away jto show underlyingparts;v

y Fig. 3 is a view 1n rear sectional elevation on the line 3-3, Fig. 2;'

rig. i is an enlarged, broken demu'view "To the accomplishment of this object, and

,ported upon trays 24and25 (Figs. v2 and in rearfsectional elevationV on the line 3 3, Fig. 2;

F ig.VV 6 is a view in perspective of'one of vthe distributing platesyforthe conduitrand its. associ ated '.partit1on-f -In the illustrated. embodiment of the inventionv lthe framefor they table comprises verticallyfdisposedanglefirons 7 andf8 (.Fig. 3),gan'd 9fand 10 (Fig. 5)'.J'The vvertical angle-irons 7 and 8' are connectedl by ahorizontal 'angle-iron l1 (Fig: 3) The* verticalangle-i'ronsQ and 110" are connected'by a horizontal angleiron 12 (Fig. 5). Bolt- 'ed to the vertical angle-irons l7 andt9 near :their upper ends, (Fig. 4)"is-a horizontal angle-1ron13 having a vertical flange 14: and a horizontal flange 15%4Bolt'ed to the vertical yangle-irons 8 and 10*- near their upper endsis a horizontal angle-iron `16 having a verticalfiange 17 anda horizontal flange 18. Bolted to the angle-irons 7 and V8 and to theangle-irons ,9and 10, respec- .tively,are horizontal angle-irons 19 and 20 similar in constructionto .the anglefirons 13 andl. Rivetedto the horizontal anges of they angle-,irons-ylyand. 20is a central bridge 21 (Figs.g3and. 4) provided with l horizontal `flanges22 fand ,23.`

-The Ysmall articles to beflnished are sup- L1) each extending substantially theventire length ofthe table. Each tray comprises a Arectangular frame 26 to thel horizontal flange of which-a wire screen' 27 is clamped by ra rivet 28 VVwhich passes through a clamping strip y29 and thehorizontal face 0fthe tray frame 26. `'lhetray-Qtis :removably supported upon the horizontal flanges 15 and 22 (Fig. 3) Land the similar horizontal flanges Von the front and rear angle-irons 19l and 2O (Figs. 2 and 4c). The tray 25 is removably supported upon the flanges 18 and 23 and the similar horizontal anges on the angle-irons 19 and V2O.V

operatives hold the Spray guns in a downy Fig. jisa`tletail viewgin sectional'plan .onthe"line:15- 5, Fig.r 1,dand

ward direction to coat the work on the trays. In order to prevent the fumes resulting from the spraying operation spreading into the room in which the operatives work and to remove the fumes to the atmosphere outside the factory, the table is provided with a trunk or conduit 30 (Figs. 2 and 3) which extends centrally beneath the trays from one end of the table to the other. The bottom of the conduit 30 is formed from a piece of galvanized sheet metal the free ends of which interlock, respectively, with sheets of galvanized metal 31 and 32 bent as shown in Fig. 3. The edges of the sheets 31 and 32 are bent, respectively, over the tops of the vertical flanges 14 and 17 (Fig. 4)V of the angle-irons 13 and 16 secured thereto by a row of rivets 33 and 34. The sheet 31 is bolted to the angle-irons 7 and 9.V The sheet 32 is bolted tothe angle-irons 8 and 10.

The front end of the table is closed by two galvanized metal sheets 35 and 36 (Fig. 3) bolted, respectively, to the angle-irons 7 and 8. The adjacent edges of the sheets 35 and' 36 are interlocked to form a stiftening rib 37 (Fig. 2) terminating-at a point high above thel trays (Fig. 3).

The rear end of t-he table is closed by two galvanized metal sheets 38 and 39v (Fig. 2) bolted,` respectively, to the angle-irons 9 and l0.V The adjacent edges of the sheets 38 and 39: are interlocked to form` a stiffening rib 40 terminatingpat a point high abovel the trays (Fig-1). y

- The front end of the conduit 30' termi- Iratesina circular opening 41 cut through the sheetsy 35 and 36. Surrounding this opening 41 and riveted to the adjacent sheets 35 and'36 is a cylindrical casing 42 (Figs. 1 and 2),k which supports a spider 43 `for a suction fan 44. The fan is driven by Vaf belt 4'5" (Figf 1l) from the'shaft of an electricfmotor" mounted on, a bracketV 47 carried by the casing' The casing communicates with duct (not shown) whichV conductstheI fumes to the atmosphere outside the factory. The Vrear end' of the conduit 3()l terminates in a rectangular' opening 4'8 (Fig. 5) cut into the lsheets 38 and 39. The opening 48 is normally closed by a sliding door 49 which' slide/sin Ways formed between` internal' and external angle-irons 50 andE 51 extending vertically adjacent the side 'edges' of the opening 4,8. l

In orderV to obtain av uniform down-draft of air` through the screens over the entire surfaces' thereof under the influence of the suction fan'the top of the conduit ispa-rtially closed' byvadjusvtable distributing plates 52 (Figs. 2, 3l and 5); Each plate comprises a sheet of galvanized metal bent adjacent their side edges to form depending ribs 53 and 54.

` The rib 53 engages the sheet 3l adjacent the top ofthe conduit 30 (Fig. 3) while the marginall flange onV the plate 52 adjacent the rib 54 engages a horizontal angle-iron 55 secured to a vertical plate 56. The opposite ends of the plate 56 are secured to the sheets 35 and 38. Fig. 3 shows an angular plate 57 secured by screws both to the sheet 35 and the front end of the plate 56. A similar plate is secured by screws both to the sheet 38 and the rear end of the plate 56. 1n addition, the plate 56 is supported by a hanger 58 having one end secured to the plateV and its other end removably held in engagement with the bottom face of the fiange 22 by a clamp 59 secured thereto.

Y The plates 52 on the other side of the table are similarly provided with ribs 60 and 61 which engage, respectively, the sheet 32 adj a cent the top of the conduit 30 and a horizontal angle-iron 62 secured to the plate 56.

As shown in Fig. 2 the distributing plates 52 may be adjusted relatively to form four openings 63, 64, 65 and 66. The opening 63 which is nearest the fan 44 is smaller than the opening 66 which is farthest froln the fan. By adjusting the plates 52 to form openings in the conduit varying in size in accordance with the distance of the openings from the fan, the down-draft of air through the screens under the iniiuence of vthe fan maybe distributed uniformly over the entire work supporting surfaces of the trays. tated in another way, the sizes of the openings inthe conduit may be varied to obtain the same` rate of iowthrough each opening notwithstanding` their different spacings from the fan'end of the conduit.

The distributing plates 52 permit thetable to be divided up into spraying stations. Thatvis, the portions of the trays 24 and 25 over the opening 63 may constitute one spraying station at which two operatives work facing each other on opposite sides of the table. Similarly the portions of the trays 24 andV 25 over the openings 64, 65 and 66 may constitute three more spraying stations at each of which two operatives work ony opposite sides of the table. The distributing plates 52`may be adjusted to form one, two, three or four openings and thus limit the table to one, two, three or four spraying stations at which two, four, six or eight operatives may work, respectively.

But whether the entire work supporting surface of one of the trays is considered a spraying station, or the entire work supporting surfaces of both trays'are considered a plurality of spraying stations, or the surfaces of the trays adjacent an opening in the conduit is considered a spraying station, or the surfaces of the trays adjacent a plurality of the openings are considered a plurality of spraying stations the result is the same, namely, that the down-draft of the air through the spraying station or plurality of spraying stations underV the influence of the fan 44 is distributed uniformly over theV invention.

entire working surface of the spraying station or surfaces of the spraying stations.

In order that the spray rtable may be eX- tremely flexible to accomodate it to widely varying classes of work and conditions of use the spraying stations therein are not separated by laterally adjacent transverse partitions in the illustrated embodiment of the This construction permits a varied selection in the number and extent of the spraying stations and the range along the table in which an operative has freedom of movement.

The material usually employed to coat the work on the trays is inflammable. In order to put out a iire, if one should occur, the table is yprovided with means for covering the trays to smother the re and with means for reducing the temperature of the coating material below its point of ignition. To this end, covers 67 and 68 are hinged at 69 and 70 (Fig. 3), for instance, to the vertical lianges,

67 and 68 cover, respectively, the trays 24 and 25. f

The cover 67 is normally held in an elevated inclined position, against plates 71 and 72 carried, respectively, by the sheets 35 and 38, by a metallic cord 73 one end of is secured to an eye 74 (Figs. 2 and 3) on the edge of the cover 68. The other end of the cord 7 3 is connected to a fusible link 75 which is connected to a hook 7 6 carried by onev face of the cover 67. Intermediate its ends the cord73 is vreeved through a hookeye 77 on the edge of the cover 67. The cover 68 is normally held in any elevated inclined position against plates 7 8 and 79 (Fig. 2) carried, respectively, by the sheets 36 and 39,- by a metallic cord 80 oneend of which is secured to an eye 81 on the edge 'of the cover 67. The other endof the cord 8O is connected to a fusible link 82 (Fig. 3) which'is connected by a hook 83 to the cover 68. Intermediate its ends the cord is reeved through an eye 84 (Fig. 2) on the edge of the cover 68. With this construction the fusible links 7 5 and 82, which are located adjacent the seat of the fire, melt under heat thus to allow the covers 67 and 68 to fall over the trays and smother the tire thereon.

In order to cool the coating material to a temperature below its point of ignition, the bridge 2l carries two vertical water pipes 85 and 86 (Fig. 2) provided at their lower ends, respectively, with sprinkler heads 87 (only one of which is shown in Fig. 3) which sprinkle water into the coating material smothered by the covers 67 and 68 to reduce the temperature of the coating material below its point of ignition. The sprinkler heads may be of the type commonly in use in overhead sprinkler systems operating automatically to open and sprinkle when the which however, be turned onV through a valve in the supply. for the -pipes and y86v whenever a fire occurs in thespray table.-

In additionv to supporting the inward edges of the distributing plates 52, the plates 56 form a central partition for the table l and thus; preventthefumes of a spray gun,-

in use byan operative on` one side of the table from'passing into the Aspraying station on the other side of the table. Y f Y 'Ilie spray table may be cleaned easily.

.Tov this end fthe trays 24 and-25 may be re-V vmoved readily. The conduit, 30 f may be "liushed and; the. resulting dirt `removed through the' opening 48 when the sliding .door 49, is elevated. In preparing for the flushing of the yconduit =3O the partition 56,

land the parts supported therefrom, such as a -the dstributing rplates 52,*may be'removed. respectively, of the bridge 21. The covers .'Nothing herein explained is to rbe interpreted as limiting the invention in the scope of its yapplication to use in connection with the particular apparatus or the particular Y inode of operation or both selected for purposes Aof illustrationlv Yand explanation. While the particularslof construction herein set vforth are-well suited to one mechanical form of the invention, it is not limited to these details of construction, nor to the conjoint use of all its features, nor is it to be understood that these particulars are essential since they may be variously modified within the skill of the artisan without departing from the true scope of the actual invention, characterizing features of which are set forth in the following claims by the intentional use of generic terms and eX- pressions inclusive of various modifications.

`What is claimed as new, is:

l. In a spray table the combination with a support for supporting the work for the spraying operation, a conduit having a pluralitjY of openings below th-e support, and means at one end of the conduit for drawing air down through the support and the openings into the conduit, of means for varying the sizes of the openings in accordance with their distances from the discharge end of the conduit to obtain a uniform flow of air down through the support over its entire surface.

2. In a spray table the combination with a work support comprising a plurality of spraying stations accommodating a plurality of laterally adjacent operatives, a conduit having a plurality of openings, substantially f 3.` In a' spray tablel the' combination with a wo'rk-v support comprising a plurality of i spraying' stationsv accommodating a plurality of laterally' adjacent operatives, a conduit having a-v plurality .of openings, substantially one to a station', and means for withdrawing fumes generated at each station dow-n through the openings into= the conduit, of means for varying the sizes of the openings inI the conduit to obtain substantially the same rate of flow through eachv opening notwithstanding their diierent spacings from-the discharge end of the: conduit.

a support for supporting thework for the spraying operation, a rectangular conduit having an open top below the support, means for partially closing the-topl of thel conduit comprising distributing plates having their y outer edges slidably engaged: with the conduit and apartition extending. into: the conduit upon which the inner edges of the distributing plates are slidably mounted, of

means `for drawing air down through the support and the openings betweenI adjacent distributing plates into the conduit.

In. testimony Whereo I have signed my name to this specification.

4FRANK G. DENNISON.

4.' In ai spray' table the combination with 

